1·The low rate of transmission to persons with casual contact suggests that aerosol transmission via the respiratory tract is not efficient, if it occurs at all.
偶然接触者的低传播率表明，如果确实发生，经过呼吸道的空气传播是无效的。
2·Results In the modalities, barium radiography of upper digestive tract, CT and angiography possess high diagnostic value, however B mode US and X scintigraphy have low diagnostic value.
结果在各种检查中上消化道钡餐造影、CT 和血管造影诊断价值较大，而B超和放射性核素显像的诊断价值较小。
3·Vacuum operated actuators open valves to select a longer, 680mm, inlet tract at low revs, increasing the rate of both the airflow and the engine torque.
真空操作打开阀门致动器来选择较长，680毫米，进道在低转速，提高利率的同时气流和发动机扭矩。
4·Scanning electron microscope and transmissional electron microscope were used to observe the ultrastructural changes of respiratory tract in rabbits inhaling low concentration of diphosgene.
用扫描电镜和透射电镜观察低剂量双光气吸入中毒所致家兔呼吸系统损伤的超微结构改变。
5·Thee height of the building is deliberately low, and it stands still so that it may nestle up moderately to the mountain of a western green tract of land.
建筑的高度特意设计的比较低，在那里静静地矗立着，就像依偎在西部广阔的绿色陆地上一座山的怀抱里。
6·AIM To evaluate the efficacy and safety of amoxicillin-clavulanic acid consecutive therapy in treating acute community-acquired low respiratory tract infections.
目的评价阿莫西林-克拉维酸序贯治疗社区获得性急性下呼吸道感染的临床疗效和安全性。
7·Objective To investigate the Clinical feature and treatment of Cytomegalovirus(CMV)-associated low respiratory tract infection(LRI) in childhood.
目的探讨小儿巨细胞病毒（CMV）相关性下呼吸道感染（LRI）的临床特点及治疗方法。
8·Objective: To evaluate the diagnostic value of low-field magnetic resonance urography (MRU) in obstructive diseases of urinary tract.
目的：评价低场强磁共振泌尿系水成像(MRU)对尿路梗阻性疾病的诊断价值。
9·Objective To investigate the old suffered with low respiratory tract infection for favourable prevention.
目的了解老年人院内下呼吸道感染情况，以利于采取预防措施。
10·Objective To assess the prevalence and presentation of low urinary tract symptoms (LUTS) in Chinese men.
目的了解成年男性人群下尿路症状（LUTS）的年龄分布与变化规律。